When I first wrote this, I was dosing Iron daily. So, I was doing all my dosing at night, then Iron and Excel in the mornings. It put time between Phosphate and Iron, reducing interaction. Then, realizing my Iron was getting a little high, I started skipping iron dosing the morning after CSM (which contains iron).
You are spot-on, but with 12 hours between iron and other nutrients, I think I'm okay.

Ok .. good deal. Yeah the time between your dosing would definitely seem long enough. I now only dose most tanks once a week since they're low light .. one day macros, next day micros and iron. Good to know I'm doing iron the right day. I keep confusing myself when to dose it .. getting to old to remember one week to the next.